4.1 Student use of Word for mathematical typesetting

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Master’s students’ perceptions of Microsoft Word for mathematical
typesetting
Birgit Loch1, Tim W. Lowe 2, and Ben D. Mestel2
Abstract
It is widely recognized that mathematical typesetting is more difficult than typesetting in most other
disciplines due to the need for specialised mathematical notation and symbols. While most
mathematicians type mathematical documents using LaTeX, with varying levels of proficiency,
students often use other options or handwrite mathematics. Here, we investigate students’
perceptions of the mathematical editor available since Word 2007. This investigation is timely as
there is anecdotal evidence that mathematicians do not think that Word is capable of quality
mathematical typesetting, and there have not been many studies in the literature on this topic.
In this case study, we ask the following questions: Is Word a suitable tool for students to typeset
mathematics? And: How does Word compare to other mathematical typesetting packages students
have used? We asked Master’s level students to typeset mathematics in Word and then comment
on their experience, relating to the ease of use, quality of output, and overall experience. We also
asked the students to compare Word to other tools they may have used in the past.
The results show that the current versions of Word are indeed capable of producing quality
mathematical typesetting, that the learning curve is not high, and that Word should not be
dismissed as a tool for typesetting mathematics. While there were concerns that editing takes longer
than in other tools and that typesetting in general takes time, overall students were positively
surprised by Word’s mathematical features and commented favourably.
1. Introduction
Throughout all levels of education, students produce mathematics assignments by hand. Indeed,
writing mathematics by hand, and doing so quickly and legibly is a necessary skill as students are
traditionally required to do this in examinations. However, at some point in their tertiary education,
many mathematics students are also required to submit project reports or theses as typeset
documents just like professional mathematicians. Producing typeset mathematics is significantly
harder than producing documents containing only text due to the need for mathematical notation
and the range of special symbols used.
Traditionally, teaching students how to produce such documents may not have been a high priority
for educators, but this is now changing and these skills are being viewed as essential to the graduate
mathematician as we will detail below. Many institutions are beginning to include such skills in their
curriculum. For example, Gray and Costanzo (2003) describe the introduction of a mathematical
typesetting module at Pennsylvania State University.
The increasing use of Virtual Learning Environments (VLEs) in many institutions also provides
pressure for students to communicate mathematics in ways other than handwritten script. For
example, many VLEs support the ability for students to submit assignments electronically, as an
uploaded document. Many institutions are moving towards this as the primary means of submission.
1
Department of Mathematics, Faculty of Science, Engineering and Technology, Swinburne
University of Technology, PO Box 218, Hawthorn VIC 3122, Australia, bloch@swin.edu.au
2
Department of Mathematics and Statistics, The Open University, Walton Hall, Milton Keynes, MK7
6AA, UK, Tim.Lowe@open.ac.uk, Ben.Mestel@open.ac.uk
Reasons for this, as reported by Brodie and Loch (2009), include financial savings and a reduction of
turnaround time for assignments. A faster turnaround, in turn, leads to educational benefits such as
faster feedback, which is critical if students are to benefit from the feedback they are given (Gibbs
and Simpson, 2004-5).
The production of electronic assignments by students in disciplines where the majority of
communication takes place using plain text can be quite straightforward, but assignments containing
substantial amounts of mathematics are more problematic. Although the electronic submission of
assignments does not ipso facto mandate electronic preparation of assignments (some students may
prepare their assignments by hand and then digitise them prior to submission), many students
choose to prepare typeset documents.
For distance-learning universities such as the UK’s Open University (OU), electronic assignment
submission allows streamlining the handling of paper-based assignments. Indeed, the OU introduced
electronic assignment submission on its mathematics master’s programme in 2009 (Jordan,
Arrowsmith, Lowe and Mestel, 2010). While the electronic marking of electronically submitted
assignments in mathematics has been researched in some detail at the OU (Lowe, Mestel and
Arrowsmith, 2007; Mestel, Arrowsmith and Lowe, 2008; Jordan, Arrowsmith, Lowe and Mestel,
2010), there have been few studies specifically on the problem of insertion of typeset mathematical
formulae by a student into an electronic assignment document.
In 2007, Microsoft introduced version 12 of its Office package, the word-processing element of
which, “Word”, included a revised mathematical typesetting environment (known as the
mathematics ribbon) which is further described below. Subsequent editions of Word have
maintained this mathematics ribbon, in particular Office 2010 (which extended the ribbon to
PowerPoint) and the most recent Word 2013. For mathematics educators, it is of especial interest to
discover whether the new mathematics capability of Word would help students produce typeset
assignments.
In this paper, we report on a study that investigated OU master students’ views of the mathematical
typesetting capability of Word - and future prospects for the use of Word by postgraduates. We
begin with an overview of mathematical typesetting for students. After a discussion of the context to
the study, we describe the methodological approach taken. Following the presentation of our
results, both quantitative and qualitative, we conclude with a summary and a discussion, and
highlight opportunities for further research.
2. Background – mathematical typesetting options for students
There are two basic approaches to producing typeset mathematical notation on a computer: either
to encode the notation using a linear syntax that is then interpreted by some system, or to use a
graphical user interface that typically consists of various palettes of symbols and mathematical
structures which are selected by the user using a mouse. The structures generally contain
placeholders that can be occupied by other structures or symbols. The graphical entry approach is
often easier for the beginner to use, but, since it necessitates constantly selecting items from
different menus or palettes, interspersed with typing characters using a keyboard, it can be slow and
hence frustrating to the more expert user.
The first, typed, approach is exemplified by the TeX mathematical typesetting system
(http://tug.org/), and, in particular, the macro package LaTeX (http://www.latex-project.org/). This
has for many years been the dominant technical typesetting environment used by professional
mathematicians, physicists and computer scientists, amongst others. Although there are palettebased front ends such as Lyx (http://www.lyx.org/) and templates to assist data input in packages
such as WinEdt (http://www.winedt.com/), LaTeX remains largely a text-input based system. In
addition to the typesetting of mathematical equations, LaTeX also offers other features often used
by mathematicians, such as automatic numbering of equations, and the ability to easily refer to such
equations.
The experiences of Gray and Costanzo (2003) show that learning to use LaTeX proficiently is not a
trivial task that can be completed easily by skimming through a manual or attending a short training
session, but rather it requires some significant effort and time commitment from the learner.
Confirming this view, Hughes and Sanchis (2004) believe that “only the most motivated students can
become proficient at TeX on their own” (p.143), and suggest the provision of some amount of formal
training in the use of TeX. It is interesting to look back to this paper written in 2004 when there was
“no current solution” that was “universally superior” (p.139). This has not changed despite major
advances in technology, leading to the now ubiquitousness of tablet devices that provide additional
input options.
The graphical approach to mathematical typesetting is typified by the “Equation Editor” in Word
prior to its 2007 edition, which used a separate window for mathematical input and editing. Whilst
this has been traditionally viewed by many professional mathematicians as awkward to use, it has
been popular amongst the general student community. Another popular graphical editor is
MathType (http://www.dessci.com/en/products/mathtype/), which links into Word. Topping (1999)
describes MathType and its ability to act as “an interactive front-end to TeX authoring” by
converting typeset mathematical formulae, or entire documents including some formulae, into
LaTeX or (Presentation) MathML (http://www.w3.org/Math/) formats. The process of creating
mathematical formulae in MathType and converting and pasting these into a TeX document,
however, appears to be laborious.
Lo, Edwards, Bokhove and Davis (2013) conducted an online survey of 80 UK-based mathematics
teachers and postgraduate students on their levels of confidence and competence using certain
commonly used input methods, with the result that Word ranked highest for confidence and
competence levels, followed by LaTeX and MathML. This survey did not focus specifically on long
mathematics assignments. It shows some similarity to the study we report on in this paper.
Electronic handwriting recognition of mathematical writing has been discussed for more than two
decades and is not a simple task, as both character recognition and mathematical structure
recognition need to be performed, see the paper by Toyozumi, Suzuki and Mori (2001) and
references therein. Although the recognition has improved significantly and recent versions of the
Microsoft Windows operating system even contain a “Math Input Panel”, the quality of recognition
is less than perfect. We agree with the views expressed by Smith and Ferguson (2004) that there is a
need for a new approach to communicating mathematics online since it is “even more difficult,
almost impossible, for students to respond with formulas and diagrams” (p.681) in mathematical elearning.
The mathematics editor, known as the equation ribbon, first introduced in Word 2007, is not only
fully integrated into the software but also offers the user the choice between a typed-syntax (similar
to LaTeX but with some differences) and a graphical input approach using an enhanced palette with
an extensive set of mathematical characters, structures, and the possibility of storing equations in a
gallery for future retrieval and re-use. The quality of the mathematical output was significantly
improved with a new Cambria Math font and glyph positioning on par with LaTeX. For clarity, in this
paper we refer to all versions of Word with the enhanced mathematical typesetting capability as
Word, without qualification. When required, we shall clarify the specific version of Word, and, in
particular, we shall always make clear when we are referring to a pre-2007 version of Word.
3. Methods
We will now provide details on the context for this study, and describe the methodology used.
3.1 Context
The Open University is the UK’s largest distance learning university with currently 14,000
undergraduate and 800 postgraduate students studying mathematical sciences modules. The vast
majority of students study part-time, through the University’s system of “open learning”.
Assessment is through assignments and a final examination.
About 500 students are studying on the OU’s postgraduate Mathematics Master of Science (MSc)
programme each year, in which students take six modules, including a final dissertation. Some
students have graduated from the OU’s Mathematics undergraduate programme, but most have
diverse academic backgrounds, and many have not studied mathematics for several years.
Following a pilot project, in 2009 the OU introduced electronic submission of assignments into its
mathematics master’s programme (Jordan et al., 2010). Participation by the students was
encouraged (but not compulsory) and take up was initially only about 28%. However, student
participation later rose rapidly so that, in 2011, 63% of all assignments submissions were electronic,
after which the university decided to make electronic submission compulsory for mathematics
master’s students. Recently, the university has decided to introduce electronic submissions also in
its mathematics and statistics undergraduate programmes from 2014 onwards. The introduction of
electronic assignment submission in the master’s programme provided a timely opportunity to
investigate Word’s capabilities.
3.2 Methodology
In 2010, a year before electronic submission of assignments became mandatory, students enrolled
on the OU’s MSc programme were invited to participate in a study on the mathematical typesetting
capabilities of Word 2007 and, in particular, of its utility for authoring student assignments.
Participants were first asked to complete an initial online questionnaire covering their previous
experience with mathematical typesetting. Afterwards the students were provided with a licensed
copy of Word 2007 to keep for their private use after the end of the study, together with a brief
introductory guide to its use. The students were then asked to use the software either to author at
least one student assignment, or to input several pages of other mathematical work. This second
option was provided because not all the participants in the study were submitting assignments
electronically. Finally, participants were asked to complete a second survey on their experience of
using the mathematical tools in MS Word.
In this paper, we adopt a mixed methods approach, encompassing analysis of both quantitative and
qualitative data from the two surveys to address the following two research questions:
1. Is Word a suitable tool for students to typeset mathematical assignments?
2. How does Word compare to other mathematical typesetting packages students have used?
We undertook a thematic analysis of the open-ended student comments. The qualitative responses
have been used to support the quantitative responses. We use a case study approach in this paper,
as we are interested in ‘process rather than outcomes, in context rather than a specific variable, in
discovery rather than confirmation’ (Merriam, 1998).
4. Results
To correlate answers between the first and second anonymous surveys, participants were asked to
input a code phrase into both surveys. Survey 1 was taken by 39 students, however, only 24
students could be identified from these who also completed survey 2. We therefore limit our data
analysis in the following to the answers of the 24 students we could match across the two surveys.
Student background and previous experiences with mathematical typesetting
We first present the results on the background of the participants. Students’ self-perception of their
computing skills was high, with 17 categorising themselves in the 7 – 10 range, on a Likert scale of 1
to 10, where 1 is a ‘beginner’ and 10 is an ‘expert’. Table 1 details student responses regarding their
previous use of several major software packages handling mathematical notation.
Table 1 Previous use of mathematics input software. Note that more than one answer was possible.
Previous mathematics input software used
MS Word 2007
LaTeX
Earlier versions of Word & Equation Editor
Earlier versions of Word & Mathtype
Maple
Open Office
Mathype standalone
Mathcad
No. students
7
11
16
3
2
2
1
1
We note that a significant number of the group (7) had previous experience of the mathematical
capabilities of Word and at least 16 had used earlier versions of MS Word (together with
mathematical input tools). We realise that this might bias the results in favour of MS Word.
We also note that 11 of the 24 participants had had prior experience with LaTeX, which is of itself
unusual in a student group, even at master’s level. Whilst this provides an excellent (and rare)
opportunity to compare student experiences of Word and LaTeX, this does suggest that the
participant group had an interest in mathematical typesetting over and above the average master’s
student in mathematics. This may not be unsurprising since these students were studying a highlevel mathematics course at a distance-learning university. It was, however, interesting to see that
15 of the students had in the past submitted assignments electronically, 13 using typeset
mathematics and 2 using scanned handwritten mathematics.
We now turn to the second survey, which was taken at the end of the semester, after a period of
experimentation and learning with Word by the participants.
4.1 Student use of Word for mathematical typesetting
To introduce students to mathematical typesetting in Word, a short guide to the mathematics
ribbon was provided for the students, which 19 considered sufficient, although the other 5 would
have preferred more training materials, for instance with more examples. Some students said they
would refer to the guide later on, as “it will serve as a useful reference guide for the future”.
All participants reported that they had fulfilled their commitment to use Word to produce at least
one assignment or substantial piece of written mathematics, with 13 having produced more than the
commitment. Moreover, the overwhelming majority of students used both methods of input in
Word: typed input and palettes. This meant that their evaluations of Word were based not just on
cursory experimentation, but rather on serious engagement with the software. 10 had used Word
2007 for at least one assignment, with a further 2 having used Word for some of one or more
assignments. However, half had not used Word for an assignment (but had trialled it for other
documents).
4.2 Student perceptions of Word for mathematical typesetting
In general, students appeared to be supportive of Word as a tool for inputting and editing
mathematics (see Figure 1). In fact, 15 rated Word as either good or very good for mathematical
input, with only 5 rating it as poor or very poor. The results for editing already typed mathematical
content were less favourable, as participants identified editing as being a weakness of Word. While
13 rated Word as good for mathematical editing, nobody thought Word was very good in this
category. In fact, 6 rated the editing feature in Word as poor or very poor. This may be due to one of
several reasons. When editing an expression using the graphical approach, it can be difficult to
position the editor cursor at the exact point of the two-dimensional notational structure required to
make the edit. Alternatively, whilst the typed interface uses LaTeX-like commands such as “\matrix”
for input, this is quickly automatically replaced by default with a solid black-box glyph. Other
commands are similarly replaced by the same glyph making the linear syntax difficult to read whilst
editing.
24
20
16
5 Very good
4 Good
12
3 Neither good nor poor
8
2 Poor
1 Very poor
4
0
Ease of
input
Ease of
editing
Quality of Overall
output experience
Figure 1 Participant evaluation of Word. Each aspect was evaluated on a five point Likert scale with (1 = very poor, 2 =
poor, 3 = neither good nor poor, 4 = good, 5 = very good).
In terms of quality of output, there is overwhelming support for Word, with 21 giving it a good or
very good rating. On the other hand, nobody rated Word as very poor, and only 1 gave a poor
evaluation. We note that this is in contrast to anecdotal wide-spread beliefs that Word does not
produce high quality mathematical typesetting!
To establish the quality of the mathematical content the students were typing in their assignments,
students were asked if they had typed as many mathematical equations and in as much detail, in
Word, as they would have done using pen and paper or any other software system. One student
commented “Yes, I made Word produce the output I wanted, and did not compromise on the maths
notation.” Another student said since he writes “all mathematical input on paper before transcribing
into Word (or LaTeX)”, Word assignment authoring did not result in different assignment content.
A major consideration in all mathematical typesetting is the time required to enter mathematical
expressions, and it appears that Word is no different. No participant rated Word as very fast,
although 7 gave it a fast rating. On the other hand, the same number (7) gave a slow rating and 2 a
very slow rating, with 8 rating the software as “neither fast nor slow”. Open ended comments show
the split views: “However the ability to produce high quality typeset mathematics in a reasonable
time is very useful.” This student also said that pen and paper would always be the easiest form to
write mathematics. Another commented that “I would write more equations with pen and paper
simply because I am not used typing maths and find it quite time consuming.”
There was also the view that while it took longer to type up an assignment at this stage and the
student “wouldn't type as much maths as when using pen and paper”, this student hoped that with
more experience this would become faster. Others hoped that with more practice they would
become faster and would be able to “take short cuts.”
When asked to comment if they had experienced any technical issues, one third of students
reported that they had. Issues raised included equation numbering and bringing up the ribbon menu
for an already-typed equation. These problems relate to the level of proficiency the students had
reached in the use of Word.
Students were then asked to integrate their separate experiences to provide an overall experience
score. 14 of the participants rated Word as good or very good, compared to 7 who rated the
software as poor or very poor. Issues raised by students include slow initial start-up, the obscuring
of mathematical text by the equation box, problems with editing (some formulae had to be ‘started
from scratch’), line numbering, alignment of equations, cross-referencing and occasional file
corruption. Matrices and polynomials were remarked on as being particularly hard to handle.
However, our impression that the new equation editor available since Word 2007 is much improved
in terms of usability and quality of output was confirmed by students who had used previous
versions, as this comment shows: “I had abandoned using the previous Word editor. Word [2007] is
very much better in all respects.”
Students’ comparison of mathematical typesetting solutions
Since participants had experience with various mathematical typesetting solutions, we were able to
compare their preferences for Word with alternative tools, see Table 2 for results. A strong
preference for Word was expressed by those who had used earlier versions of Word together with
equation editor, and by those who had used OpenOffice (http://www.openoffice.org/). A student
who had been using MathType in the past thought that Word would be “OK for the inexperienced or
occasional user, but is frustratingly cumbersome for the experienced user [of other systems]”.
Since most students had only used LaTeX or Word, we will now focus this discussion on the
comparison of these two tools. Previous LaTeX users were split between those who preferred Word
8) and those who preferred LaTeX (12), with the rest expressing no preference. In their comments, a
small number of students with LaTeX expertise didn’t see the need for another tool and thought
Word was “too much hassle”.
Table 2 Preferences for Word over an alternative software package
Alternative software package
Prefers
Word
No preference
Prefers
alternative
Total number who
used the alternative
Earlier version of Word & Equation editor
Earlier version of Word & Mathtype
OpenOffice
LaTeX
Other
14
3
4
4
1
0
2
2
2
0
2
2
0
6
0
16
7
6
12
0
It was interesting to see that, in general, students who are using LaTeX (although we have no
information about their level of proficiency) commented that they preferred LaTeX, as they had
already invested in the learning process and because they appreciated the high quality of the output
generated in LaTeX. The fact that in LaTeX coding can happen entirely with the keyboard and
without the use of the mouse was seen as an advantage for LaTeX. In addition, it was seen as
slowing down the process when the palette is used for Word, as reflected in this student comment:
“LaTeX is much easier because when you've learned the code, you can type quickly, but with Word
2007, you have to keep using the mouse which makes things slow”. In contrast, another student
commented that once you know the keyboard shortcuts in Word, it is faster than LaTeX. It appears
that personal preferences play a role, as the following comment confirms: “I found the balance of
markup input (a la LaTeX) and mouse input was very good [in Word]”.
Other student comments related to the immediacy of seeing the mathematical typesetting. A
student who prefers LaTeX pointed out that “Word is much more visual than LaTeX, but LaTeX is
much faster once you are used to it.” This “ability to see the output ‘as you go’“ was viewed as
helpful by another student. However, editing already typed mathematical formulas was more
difficult in Word than in LaTeX: “often deleting far more than intended when using backspace, for
example - very frustrating”. The same student, on the other hand, liked that aligning equations was
quicker in Word than in LaTeX. Nevertheless, he still preferred LaTeX to Word for its more
professional output.
There also seemed to be the view that both LaTeX and Word are useful for typesetting mathematical
documents and should be used in combination: “For the purely mathematical input, LaTeX works a
bit better. For the overall document, especially with graphical input, Word is easier. I like the way
that I can use Word normally, and add mathematical material as needed.”
As we have seen, students appeared to generally think favourably of Word for mathematics entry.
Several students said they were impressed, “I was very impressed, I wrote my 80 page Master’s
Dissertation using it, not having used it before, and I quickly got into it. I was used to Word 97, so
using 2007 was a major change, with its new ribbon structure.” Another said it was not difficult to
learn to use it as a relative novice and that he “quickly felt comfortable with it” and would use it for
his next assignment. He also said that he “would not have dreamt [he] would have done so before
this experiment”. We also received the comment “I found that it is doable - anything else I had tried
is not. I produced a fine TMA [Tutor-Marked Assignment] and my tutor was complimentary about
the presentation“. The following student summarised what many may have been thinking:
“I feel that I don't have to learn LaTeX because I am satisfied with Word 07.”
There was, however, also one concern raised regarding the fact that electronic assignment authoring
may replace handwritten mathematical working, with a student commenting that he was concerned
that he “will not have the practice of handwriting solutions - which is necessary for the exams.”
Finally, we asked the participants whether they would use Word for mathematical typesetting in the
future. The majority (14) intended to use Word for mathematics either frequently or very frequently
in the future, with 4 rarely or never, while 6 of the participants intended to use Word occasionally.
For authoring assignments, 11 would use Word frequently or very frequently, while 7 would use the
software either rarely or never.
5. Discussion and conclusion
Although professional mathematical typesetting is common amongst mathematicians and
mathematics educators in higher education, student engagement has lagged substantially behind
that of their lecturers. We suggest several reasons for this lack of engagement.
First, the higher education mathematics curriculum is already overloaded and educators have been
reluctant to release credits, even as part of a wider employability and generic skills agenda. Second,
some educators believe teaching mathematical typesetting would give an overemphasis to form
over content and, indeed, might even detract from mathematics learning, especially when one takes
into account the time taken to acquire and to use the necessary skills. Third, there has been a fear
that the widespread use of mathematical typesetting by students, especially in the preparation of
their assignments, would necessarily result in the loss of intermediate steps in calculations, thereby
making it harder for educators to diagnose mistakes. Fourth, there has been a reluctance to teach
skills which students will not be able to use in examinations and which may not be of great utility in
their future lives, except when needed for the production of dissertations or project reports.
Finally, the quality of mathematics output in standard word-processing programs such as Microsoft
Word has in the past not been comparable with that produced from LaTeX, which has added to the
reluctance to include mathematical typesetting other than LaTeX in the curriculum. We note that
since this study was conducted, tools such as the web-based instant rendering WriteLaTeX have
emerged, which may be well worth investigating as an alternative in a future study.
Have the new mathematical typesetting capabilities of Word alleviated the concerns highlighted
above? We believe so, as at least MSc students were positively surprised by Word’s mathematical
features and commented favourably, in particular with regard to quality of output and ease of input,
although doubts still remain about the editing of mathematical expressions. The results show that
the current versions of Word are indeed capable of producing quality mathematical typesetting, that
the learning curve is not steep, and that Word cannot be dismissed as a tool for students to typeset
their mathematical assignments. Although there were concerns that editing takes longer in Word
than in other tools and that typesetting in general takes time, student impressions were positive.
Recalling the principal research questions that we posed above, our results suggest that Word may
indeed be a suitable tool for students to typeset mathematical assignments, although students may
well need some training in order for them to make best use of the package. Certainly, many of the
students who were introduced to Word will continue to use it in their studies, to a greater or lesser
degree. With regard to our second question, it is clear that Word does compare favourably with
other mathematical typesetting packages students have used, especially compared with earlier
versions of Word and embedded packages, and, at least in some students’ experience, with LaTeX.
Of course, the wider educational questions proposed above remain largely unanswered by our
study, although many concerns about the use of mathematical typesetting would dissipate if the
speed of mathematical typesetting were to be significantly enhanced. However, we are far off from
the mathematical handwriting recognition necessary for such an advance although there are
research projects in the field, e.g. MathPen (Lo et al., 2013), to convert handwriting into typeset text
and mathematics.
One future direction for research follows on from a comment raised by a student, which appears to
imply that this student no longer writes mathematics on paper. It would be of considerable interest
to discover whether students indeed do reduce the amount of handwriting while working through a
mathematical problem, as this could have serious consequences on the amount of deep learning
that occurs during practice, by “doing” the maths by writing it out. This is of particular importance
when considering the still common paper-based end-of-semester exams as they may be the first
major assessment item that requires students to write complete mathematical explanations by
hand.
We note that our results are not meant to convince a mathematician to change from LaTeX to Word,
but hope that they will encourage educators to consider Word as an alternative for student use. We
also acknowledge that this case study provided insight into the perceptions of only one cohort of
Master level students. Further research is needed in this area, with larger participation groups,
before generalisations can be made.
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